As we all know, the gas combustion product is mainly Co, CO2, H2O during the fire, which produces more than the burning cigarette (20 minutes to several hours), and is different from smoke particles in fire flue gas, and the gas needs less The heat driver can rise rapidly, and H2O is usually not a fire detection parameter due to the influence of humidity in the environment. CO is a unique sign of extremely early fires. Due to the general case, the content of Co is extremely low in air, even in a kitchen such as a CO content, the content of Co is equal to 20 ppm or less. However, in the process of fire, almost every substance has to produce unsachable combustible COs, especially the fire in the fuel stage, and is born from the fire to violent burning, Co experience is not available, from small to large, Then gradually decrease the regular change process, and Co is smaller than the air density, more likely to float the fire detector on the ceiling to achieve an early warning. Pseudo fires are generally not produced by CO, or their magnitude is small. Therefore CO is suitable for early detection of fire. This is important for the arrangement of fire detectors and capture fires in an earlier time.
For the generation of COs in the fire, relevant researchers at home and abroad have conducted a lot of trials, such as Jackson and Kobins gave the 6 kinds of standard fire measured in the experiment in 1994: wood flame, wood pyrolysis, cotton yolus fire, Polyurethane plastic foam open flame, n-heptane is clear, alcoholic fire, etc., the largest CO generation amount in unit area.
Pfister also monitored and recorded a variation process of several standard fire CO generation during the experiment in 1997. The concentration of CO has a certain degree of increase in a certain period of time after the fire, and is significantly higher than the concentration of CO in the environment in the event of a fire.
To evaluate the adaptability of various fires, the British researchers use six experiments specified in the European standard EN54 to control the CO sensor, the temperature sensing detector, and beam type smoke. Test proves that the CO sensor is the only detector that responds to six test fires in the seven detectors of the test.
British researchers made a limited area (closed wardrobe, laminated) combustion test, 25 min before any smoke detector, the CO concentration produced by fire reached 50 ppm, and the CO sensor can respond.
In addition, the trial of the real fire showed that in most cases, CO can be used as a good fire indicator gas in most cases, when the fire may appear in the form of a fire, such as residential area and office fire , CO is the best fire indicator gas. In these fires, effective CO concentrations can appear at several hours before the smoke is detected.
In the past, since people's understanding of lack of deficiencies and early CO sensor detection sensitivity, high power consumption, cost-effective shortcomings restricted its application, in recent years, carbon monoxide sensing technology has made a certain breakthrough, and the power consumption is significantly reduced, the sensitivity and life are improve.
At present, Shenzhen Mining Net Co., Ltd. provides a new CO sensor TGS5141 and TGS5042, as follows:
The characteristics of the carbon monoxide sensor TGS5141:
Ultra-small, button battery size
Battery-driven
High-carbon monoxide selective / repeatability
High linear output characteristics for carbon monoxide
Calibration is easy
long lasting
Get UL certification
Meet the requirements of UL2034, EN50291 and EN54-31
The characteristics of the carbon monoxide sensor TGS5042:
Battery-driven
High-carbon monoxide selective / repeatability
High linear output characteristics for carbon monoxide
Calibration is easy
long lasting
Get UL certification
Meet the requirements of UL2034, EN50291 and RoHS, read the full text
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